Nikander R, Kannus P, Dastidar P, Hannula M, Harrison L, Cervinka T, Narra N G, Aktour R, Arola T, Eskola H, Soimakallio S, Heinonen A, Hyttinen J, Sievänen H
Bone Research Group, UKK Institute for Health Promotion Research, 33501 Tampere, Finland.
Osteoporos Int. 2009 Aug;20(8):1321-8. doi: 10.1007/s00198-008-0785-x. Epub 2008 Nov 11.
Compared to high-impact exercises, moderate-magnitude impacts from odd-loading directions have similar ability to thicken vulnerable cortical regions of the femoral neck. Since odd-impact exercises are mechanically less demanding to the body, this type of exercise can provide a reasonable basis for devising feasible, targeted bone training against hip fragility.
Regional cortical thinning at the femoral neck is associated with hip fragility. Here, we investigated whether exercises involving high-magnitude impacts, moderate-magnitude impacts from odd directions, high-magnitude muscle forces, low-magnitude impacts at high repetition rate, or non-impact muscle forces at high repetition rate were associated with thicker femoral neck cortex.
Using three-dimensional magnetic resonance imaging, we scanned the proximal femur of 91 female athletes, representing the above-mentioned five exercise-loadings, and 20 referents. Cortical thickness at the inferior, anterior, superior, and posterior regions of the femoral neck was evaluated. Between-group differences were analyzed with ANCOVA.
For the inferior cortical thickness, only the high-impact group differed significantly (approximately 60%, p = 0.012) from the reference group, while for the anterior cortex, both the high-impact and odd-impact groups differed (approximately 20%, p = 0.042 and p = 0.044, respectively). Also, the posterior cortex was approximately 20% thicker (p = 0.014 and p = 0.006, respectively) in these two groups.
Odd-impact exercise-loading was associated, similar to high-impact exercise-loading, with approximately 20% thicker cortex around the femoral neck. Since odd-impact exercises are mechanically less demanding to the body than high-impact exercises, it is argued that this type of bone training would offer a feasible basis for targeted exercise-based prevention of hip fragility.
与高强度运动相比，来自异常加载方向的中等强度冲击在增厚股骨颈易损皮质区域方面具有相似的能力。由于异常冲击运动对身体的机械要求较低，这种运动类型可为设计可行的、针对性的预防髋部脆性骨折的骨骼训练提供合理依据。
股骨颈局部皮质变薄与髋部脆性骨折相关。在此，我们研究了涉及高强度冲击、来自异常方向的中等强度冲击、高强度肌肉力量、高重复率的低强度冲击或高重复率的无冲击肌肉力量的运动是否与更厚的股骨颈皮质相关。
我们使用三维磁共振成像扫描了91名女性运动员的近端股骨，这些运动员代表上述五种运动负荷情况，另外还扫描了20名对照者。评估了股骨颈下部、前部、上部和后部区域的皮质厚度。采用协方差分析（ANCOVA）分析组间差异。
对于下部皮质厚度，只有高强度冲击组与对照组有显著差异（约60%，p = 0.012），而对于前部皮质，高强度冲击组和异常冲击组均有差异（分别约为20%，p = 0.042和p = 0.044）。此外，这两组的后部皮质也厚约20%（分别为p = 0.014和p = 0.006）。
与高强度运动负荷一样，异常冲击运动负荷也与股骨颈周围皮质增厚约20%相关。由于异常冲击运动对身体的机械要求低于高强度运动，因此有人认为这种骨骼训练类型将为基于运动的针对性预防髋部脆性骨折提供可行依据。
